max9744 Maxim Integrated Products, Inc., max9744 Datasheet - Page 10

• Manufacturer Part Number: max9744
• Description: 20w Stereo Class D Speaker Amplifier With Volume Control
• Manufacturer: Maxim Integrated Products, Inc.

-100
-120
-140
20W Stereo Class D Speaker Amplifier
with Volume Control
(V
OUT_+ and OUT_- with an inductor in series, 8Ω load, L = 68µH, 4Ω load, L= 33µH. R
C
10
-20
-40
-60
-80
IN
0
PVDD
0
= 0.47µF, R
______________________________________________________________________________________
OUTPUT FREQUENCY SPECTRUM
= 12V, V
(FILTERLESS MODULATION)
-100
-120
-20
-40
-60
-80
5
20
OUTPUT WAVEFORM
0
(SPREAD-SPECTRUM MODULATION MODE)
FREQUENCY (kHz)
0
IN
RIGHT
RBW = 1kHz
INPUT AC GROUNDED
FILTERLESS MODULATION
DD
WIDEBAND OUTPUT SPECTRUM
= 20kΩ, R
1μs/div
= 3.3V, V
10
LEFT
FREQUENCY (MHz)
1
SSM MODE
V
f = 1kHz
R
UNWEIGHTED
IN
L
15
F_
= 4Ω
GND
= -60dBV
= 20kΩ, spread-spectrum mode, T
MAX9744 toc33
= V
20
10
PGND
2V/div
2V/div
-100
-120
= 0V, V
-20
-40
-60
-80
20
0
100
(FIXED-FREQUENCY MODULATION MODE)
0
Typical Operating Characteristics (continued)
RBW = 1kHz
INPUT AC GROUNDED
FILTERLESS MODULATION
WIDEBAND OUTPUT SPECTRUM
MUTE
OUTPUT WAVEFORM (PWM)
= 0V; max volume setting; all speaker load resistors connected between
FREQUENCY (MHz)
1
1μs/div
A
= +25°C, unless otherwise noted.)
10
MAX9744 toc34
-100
-120
-20
-40
-60
-80
20
0
100
(SPREAD-SPECTRUM MODULATION MODE)
0
RBW = 1kHz
INPUT AC GROUNDED
PWM MODE
2V/div
2V/div
WIDEBAND OUTPUT SPECTRUM
L
= ∞, unless otherwise stated, C
FREQUENCY (MHz)
1
-100
-120
-100
-120
-140
-20
-40
-60
-80
-20
-40
-60
-80
20
0
0
(FIXED-FREQUENCY MODULATION MODE)
0
0
RBW = 1kHz
INPUT AC GROUNDED
PWM MODE
OUTPUT FREQUENCY SPECTRUM
WIDEBAND OUTPUT SPECTRUM
10
5
FREQUENCY (MHz)
FREQUENCY (kHz)
1
RIGHT
100
10
LEFT
10
BIAS
FFM MODE
V
f = 1kHz
R
UNWEIGHTED
IN
L
15
= 4Ω
= -60dBV
= 2.2µF,
100
20